Rotary fan



Oct. zo, 1931.

P. SUTER ROTARY FAN Filed Feb. e, 1926 Patented Oct. 20, 1931 UNITEDSTATES PATENT OFFICE PHILIPP SUTER, OF BADEN, SWITZERLAND, ASSIGNOR TAKTIENGESELLSCHAFT BROWN BOVERI & CIE., 0F BADEN, SWITZERLAND, AJOINT-STOCK COMPANY 0]? SWITZERLAND ROTARY FAN Applicationled February6, 1926, Serial No. 86,596, and in Germany February 6, 1925.

rlhis invention relates to improvements in rotary fans.

One of the objects of the present invention is to provide an improvedrotary fan construction having advantages over suchconstructions of theprior art as regards simplicity of construction and cost of manufacture.

Other objects and advantages will hereinafter appear.

F or the purpose of illustrating ,the invention, one embodiment thereofis shown in the drawings, wherein Figure l is a front elevational view;and

Fig. 2 is a side elevational view, partly in section, the section beingtaken on the line 2 2 in Fig. l.

Ine improved rotary fan construction includes a. fluid-impelling unitdisposed about and in spaced and concentric relation with Y theoperating shaft c, such unit comprising the ring or hoop a with theblades o extending laterally therefrom and provided with thecircumferentially-spaced and radially and inwardly directed spacingmembers Z provided at their respective inner ends with the parts or feetcl extending axially of the shaft and seating thereupon, the members loperating to maintain concentric relation between the shaft and thefluid-impelling unit and being secured at their respective outer ends toring a by any suitable means such as the spot welds fw.

The parts or feet cl are embraced by the fastening means or band e whichmay be shrunk over the shaft and parts cl, as indicated, to hold thelatter in firm seating engagement with the shaft. The parts or feet dmay be slightly flexible so that they yield somewhat to the constrainingpressure of the fastening band, which action contributes toward a betterdriving connection between the shaft and the fluid-impelling unit.

The fastening means or band e engages the adjacent faces of the spacingmembers cl, as more clearly shown in Fig. 2, and thereby provideslateral reenforcement for the same.

. As shownin Fig. l, the band e has a polygonalconiguration, theperipheral portions e which engage the parts or feet d being joinedwhich are substantially tangential of the shaft c and between which thefeet d are locked to hold the same in fixed relation with respect toeach other in a direction circumferentially of the shaft c.

lVhile but one embodiment of the invention has been shown and described,it will be understood that various changes might be made such as in thesize, shape and arrangement of the parts without departing from thespirit of the invention or the scope of the claim.

I claim:

In rotary fan construction, an operating shaft, fluid-impellingstructure disposed about said shaft and provided with feet portionsengaging and extending axially of said shaft, said feet portions beingdisposed in spaced relation with respect to each other in a directioncircumferentially of said shaft, and a band disposed about said shaftand said feet portions and holding the latter in firm engaging relationwith said shaft, said band having a polygonal configuration comprisingperipheral portions engaging said feet portions and joined byintermediate peripheral portions substantially tangential of said shaftand between which said feet portions are locked in said relation withrespect to each other.

In testimony whereof I have hereunto subscribed my name at Zurich,Switzerland, on the 20th day of January, A. D. 1926.

PHILIPP SUTER.

